L.g.f.: log( Sum_{n>=0} A000108(n)^2*x^n ) = Sum_{n>=1} a(n)*x^n/n, where A000108(n) = binomial(2*n,n)/(n+1) forms the Catalan numbers.
A213515
L.g.f.: log( Sum_{n>=0} A000108(n)^2*x^n ) = Sum_{n>=1} a(n)*x^n/n, where A000108(n) = binomial(2*n,n)/(n+1) forms the Catalan numbers.
Terms
- a(0) =1a(1) =7a(2) =64a(3) =667a(4) =7526a(5) =89614a(6) =1109578a(7) =14153379a(8) =184819348a(9) =2459689862a(10) =33253032748a(11) =455530364830
External references
- oeis: A213515